fs/nfsd/blocklayoutxdr.c

   1 /*
   2  * Copyright (c) 2014-2016 Christoph Hellwig.
   3  */
   4 #include <linux/sunrpc/svc.h>
   5 #include <linux/exportfs.h>
   6 #include <linux/nfs4.h>
   7
   8 #include "nfsd.h"
   9 #include "blocklayoutxdr.h"
  10
  11 #define NFSDDBG_FACILITY        NFSDDBG_PNFS
  12
  13
  14 __be32
  15 nfsd4_block_encode_layoutget(struct xdr_stream *xdr,
  16                 struct nfsd4_layoutget *lgp)
  17 {
  18         struct pnfs_block_extent *b = lgp->lg_content;
  19         int len = sizeof(__be32) + 5 * sizeof(__be64) + sizeof(__be32);
  20         __be32 *p;
  21
  22         p = xdr_reserve_space(xdr, sizeof(__be32) + len);
  23         if (!p)
  24                 return nfserr_toosmall;
  25
  26         *p++ = cpu_to_be32(len);
  27         *p++ = cpu_to_be32(1);          /* we always return a single extent */
  28
  29         p = xdr_encode_opaque_fixed(p, &b->vol_id,
  30                         sizeof(struct nfsd4_deviceid));
  31         p = xdr_encode_hyper(p, b->foff);
  32         p = xdr_encode_hyper(p, b->len);
  33         p = xdr_encode_hyper(p, b->soff);
  34         *p++ = cpu_to_be32(b->es);
  35         return 0;
  36 }
  37
  38 static int
  39 nfsd4_block_encode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b)
  40 {
  41         __be32 *p;
  42         int len;
  43
  44         switch (b->type) {
  45         case PNFS_BLOCK_VOLUME_SIMPLE:
  46                 len = 4 + 4 + 8 + 4 + b->simple.sig_len;
  47                 p = xdr_reserve_space(xdr, len);
  48                 if (!p)
  49                         return -ETOOSMALL;
  50
  51                 *p++ = cpu_to_be32(b->type);
  52                 *p++ = cpu_to_be32(1);  /* single signature */
  53                 p = xdr_encode_hyper(p, b->simple.offset);
  54                 p = xdr_encode_opaque(p, b->simple.sig, b->simple.sig_len);
  55                 break;
  56         case PNFS_BLOCK_VOLUME_SCSI:
  57                 len = 4 + 4 + 4 + 4 + b->scsi.designator_len + 8;
  58                 p = xdr_reserve_space(xdr, len);
  59                 if (!p)
  60                         return -ETOOSMALL;
  61
  62                 *p++ = cpu_to_be32(b->type);
  63                 *p++ = cpu_to_be32(b->scsi.code_set);
  64                 *p++ = cpu_to_be32(b->scsi.designator_type);
  65                 p = xdr_encode_opaque(p, b->scsi.designator, b->scsi.designator_len);
  66                 p = xdr_encode_hyper(p, b->scsi.pr_key);
  67                 break;
  68         default:
  69                 return -ENOTSUPP;
  70         }
  71
  72         return len;
  73 }
  74
  75 __be32
  76 nfsd4_block_encode_getdeviceinfo(struct xdr_stream *xdr,
  77                 struct nfsd4_getdeviceinfo *gdp)
  78 {
  79         struct pnfs_block_deviceaddr *dev = gdp->gd_device;
  80         int len = sizeof(__be32), ret, i;
  81         __be32 *p;
  82
  83         p = xdr_reserve_space(xdr, len + sizeof(__be32));
  84         if (!p)
  85                 return nfserr_resource;
  86
  87         for (i = 0; i < dev->nr_volumes; i++) {
  88                 ret = nfsd4_block_encode_volume(xdr, &dev->volumes[i]);
  89                 if (ret < 0)
  90                         return nfserrno(ret);
  91                 len += ret;
  92         }
  93
  94         /*
  95          * Fill in the overall length and number of volumes at the beginning
  96          * of the layout.
  97          */
  98         *p++ = cpu_to_be32(len);
  99         *p++ = cpu_to_be32(dev->nr_volumes);
 100         return 0;
 101 }
 102
 103 int
 104 nfsd4_block_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
 105                 u32 block_size)
 106 {
 107         struct iomap *iomaps;
 108         u32 nr_iomaps, expected, i;
 109
 110         if (len < sizeof(u32)) {
 111                 dprintk("%s: extent array too small: %u\n", __func__, len);
 112                 return -EINVAL;
 113         }
 114
 115         nr_iomaps = be32_to_cpup(p++);
 116         expected = sizeof(__be32) + nr_iomaps * PNFS_BLOCK_EXTENT_SIZE;
 117         if (len != expected) {
 118                 dprintk("%s: extent array size mismatch: %u/%u\n",
 119                         __func__, len, expected);
 120                 return -EINVAL;
 121         }
 122
 123         iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
 124         if (!iomaps) {
 125                 dprintk("%s: failed to allocate extent array\n", __func__);
 126                 return -ENOMEM;
 127         }
 128
 129         for (i = 0; i < nr_iomaps; i++) {
 130                 struct pnfs_block_extent bex;
 131
 132                 memcpy(&bex.vol_id, p, sizeof(struct nfsd4_deviceid));
 133                 p += XDR_QUADLEN(sizeof(struct nfsd4_deviceid));
 134
 135                 p = xdr_decode_hyper(p, &bex.foff);
 136                 if (bex.foff & (block_size - 1)) {
 137                         dprintk("%s: unaligned offset 0x%llx\n",
 138                                 __func__, bex.foff);
 139                         goto fail;
 140                 }
 141                 p = xdr_decode_hyper(p, &bex.len);
 142                 if (bex.len & (block_size - 1)) {
 143                         dprintk("%s: unaligned length 0x%llx\n",
 144                                 __func__, bex.foff);
 145                         goto fail;
 146                 }
 147                 p = xdr_decode_hyper(p, &bex.soff);
 148                 if (bex.soff & (block_size - 1)) {
 149                         dprintk("%s: unaligned disk offset 0x%llx\n",
 150                                 __func__, bex.soff);
 151                         goto fail;
 152                 }
 153                 bex.es = be32_to_cpup(p++);
 154                 if (bex.es != PNFS_BLOCK_READWRITE_DATA) {
 155                         dprintk("%s: incorrect extent state %d\n",
 156                                 __func__, bex.es);
 157                         goto fail;
 158                 }
 159
 160                 iomaps[i].offset = bex.foff;
 161                 iomaps[i].length = bex.len;
 162         }
 163
 164         *iomapp = iomaps;
 165         return nr_iomaps;
 166 fail:
 167         kfree(iomaps);
 168         return -EINVAL;
 169 }
 170
 171 int
 172 nfsd4_scsi_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
 173                 u32 block_size)
 174 {
 175         struct iomap *iomaps;
 176         u32 nr_iomaps, expected, i;
 177
 178         if (len < sizeof(u32)) {
 179                 dprintk("%s: extent array too small: %u\n", __func__, len);
 180                 return -EINVAL;
 181         }
 182
 183         nr_iomaps = be32_to_cpup(p++);
 184         expected = sizeof(__be32) + nr_iomaps * PNFS_SCSI_RANGE_SIZE;
 185         if (len != expected) {
 186                 dprintk("%s: extent array size mismatch: %u/%u\n",
 187                         __func__, len, expected);
 188                 return -EINVAL;
 189         }
 190
 191         iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
 192         if (!iomaps) {
 193                 dprintk("%s: failed to allocate extent array\n", __func__);
 194                 return -ENOMEM;
 195         }
 196
 197         for (i = 0; i < nr_iomaps; i++) {
 198                 u64 val;
 199
 200                 p = xdr_decode_hyper(p, &val);
 201                 if (val & (block_size - 1)) {
 202                         dprintk("%s: unaligned offset 0x%llx\n", __func__, val);
 203                         goto fail;
 204                 }
 205                 iomaps[i].offset = val;
 206
 207                 p = xdr_decode_hyper(p, &val);
 208                 if (val & (block_size - 1)) {
 209                         dprintk("%s: unaligned length 0x%llx\n", __func__, val);
 210                         goto fail;
 211                 }
 212                 iomaps[i].length = val;
 213         }
 214
 215         *iomapp = iomaps;
 216         return nr_iomaps;
 217 fail:
 218         kfree(iomaps);
 219         return -EINVAL;
 220 }